Demonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality

Abstract

Increasingly sophisticated quantum computers motivate the exploration of their abilities in certifying genuine quantum phenomena. Here, we demonstrate the power of state-of-the-art IBM quantum computers in correlation experiments inspired by quantum networks. Our experiments feature up to 12 qubits and require the implementation of paradigmatic Bell-State Measurements for scalable entanglement-swapping. First, we demonstrate quantum correlations that defy classical models in up to nine-qubit systems while only assuming that the quantum computer operates on qubits. Harvesting these quantum advantages, we are able to certify 82 basis elements as entangled in a 512-outcome measurement. Then, we relax the qubit assumption and consider quantum nonlocality in a scenario with multiple independent entangled states arranged in a star configuration. We report quantum violations of source-independent Bell inequalities for up to ten qubits. Our results demonstrate the ability of quantum computers to outperform classical limitations and certify scalable entangled measurements.

7 pages + appendix, 13 figures

References in corpus (6)

• The Quantum Internet
• Quantum transduction of optical photons from a superconducting qubit
• Characterization of addressability by simultaneous randomized benchmarking
• Experimental demonstration of fault-tolerant state preparation with superconducting qubits
• Nonlocal correlations in the star-network configuration
• Bilocal Bell inequalities violated by the quantum Elegant Joint Measurement

Cited by in corpus (27)

• Quantum theory based on real numbers can be experimentally falsified
• Bell nonlocality in networks
• Full network nonlocality
• Entanglement swapping and quantum correlations via Elegant Joint Measurements
• Quantifying Quantumness of Channels Without Entanglement
• Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics
• Quantum violation of local causality in urban network with hybrid photonic technologies
• Discriminating mixed qubit states with collective measurements
• Observation of Genuine High-dimensional Multi-partite Non-locality in Entangled Photon States
• Proposals for ruling out the real quantum theories in an entanglement-swapping quantum network with causally independent sources
• Correspondence between entangled states and entangled bases under local transformations
• Prepare-and-measure scenarios with photon-number constraints
• Quantum teleportation based on the elegant joint measurement
• Non-adaptive measurement-based quantum computation on IBM Q
• Generating multipartite nonlocality to benchmark quantum computers
• Symmetric quantum joint measurements on multiple qubits
• A more generalized two-qubit symmetric quantum joint measurement
• Nonlocal correlations in an asymmetric quantum network
• Towards minimal self-testing of qubit states and measurements in prepare-and-measure scenarios
• A scalable tripartite Wigner's friend scenario
• Experimental genuine quantum nonlocality in the triangle network
• Guarantees on the structure of experimental quantum networks
• Non-locality of conjugation symmetry: characterization and examples in quantum network sensing
• The Multiqubit Elegant Joint Measurement
• Exploring the Local Landscape in the Triangle Network
• Empirical Power of Quantum Encoding Methods for Binary Classification
• Distribution of Non-Locality On Quantum Random Circuits